[Bug tree-optimization/26400] New: Missed jump threading on the tree level

[pinskia at gcc dot gnu dot org]

Missed jump threading on the tree level with the following C code:
struct a
{
  int t;
};
int f(struct a *b, struct a *c)
{
  if (b != c)
  {
    int *d = &b->t;
    int *d1 = &c->t;
    if (d == d1)
       return 1;
  }
  return 0;
}

----
This shows up in tramp3d:
  if (__last != __last.8832) goto <L16>; else goto <L17>;

<L16>:;
  if (&__last->engine_m != &__last.8832->engine_m) goto <L18>; else goto <L17>;


-- 
           Summary: Missed jump threading on the tree level
           Product: gcc
           Version: 4.2.0
            Status: UNCONFIRMED
          Keywords: missed-optimization, TREE
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: pinskia at gcc dot gnu dot org
OtherBugsDependingO 22501
             nThis:


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26400